Can't seem to find any reason why but..
Sometimes when setting up drawings, or editing drawings and you attach an xref, and you check relative path, it won't let you do it.

Does anyone know why?
It's usually on a drawing that has an xref already, which may be part of it.

But I think I've actually set up brand new drawings with xrefs, where I set the first two to relative and when attaching the third xref, it wouldn't let me select relative path.

Any insight on what would cause this would be appreciated.

Thanks